Cosmoplast manufactures uPVC pipes with sizes ranging from 20mm to 1,200mm in both imperial and metric dimensions. Pipes can be made to match non-pressure drainage or up to 16 Bar pressure water distribution system requirements. They are designed for a safety factor of 2:1 with a 50 year installed lifetime. Pipes are normally available and supplied with integral joints in 6m or 9m lengths.
Working Pressure
Under normal conditions, the operating temperature is considered to be 20°C. In the Middle East region, the temperature conditions are usually higher and thus pressure ratings must be reduced in proportion. As the ambient temperature increases, the operating pressure ratings are reduced especially when pipes are installed above ground.
Thermal Movement
Expansion and contraction in a pipeline system due to temperature changes can be calculated using the following formula.
Where dl = a x L x dt
µ = Co-efficient of thermal expansion.
dl = Change in length in mm
L = Original length of pipe in metres
dt = Total temperature range in °C.
Thermal expansion and contraction should be calculated taking into consideration the minimum and maximum ambient temperatures. Taking into account the variations in the pipeline, the location of support brackets could be planned.
